Decision guide
Biweekly Mortgage Payment Calculator
Last updated: October 2026
Biweekly payments are sold as a trick of timing: pay half every two weeks and save tens of thousands. The saving is real, but it comes almost entirely from one thing. Half a payment every two weeks is 26 half payments, or 13 full payments a year instead of 12.
This calculator separates the two effects. It runs your loan four ways: monthly, one extra payment a year, one-twelfth extra each month, and true biweekly. Then it shows how much of the saving comes from the extra money and how much from paying sooner. Enter a program's fees to see when it pays for itself.
Inputs
Your mortgage, and any program fees.
Calculating the default example.
The extra payment does the work
A monthly payment of $2,000 becomes $1,000 every two weeks. Over a year that is $26,000 instead of $24,000. The extra $2,000 goes straight to principal, which cuts the interest on every later payment and ends the loan years early.
Paying sooner also helps, because each half payment reduces the balance a couple of weeks earlier. But that effect is small. The second result shows how much of the saving you would keep by just adding one-twelfth of a payment each month.
Schedule checks
The calculator covers principal and interest only, assumes a fixed rate, and assumes the servicer applies each payment the day it arrives.
Four ways to pay the same loan
Every row starts from the same balance and rate. The three faster rows all send about one extra payment a year. They differ only in when that money arrives.
| Schedule | Payoff Time | Total Interest | Interest Saved | Total Paid |
|---|
Example 1: $320,000 at 6.5% over 30 years
A $320,000 mortgage at 6.5% for 30 years has a principal and interest payment of $2,022.62. Paid monthly, it costs $408,140.64 in interest.
Pay $1,011.31 every two weeks instead and the loan ends in 24 years, 6 years early, with $96,446.25 less interest. Now keep the monthly schedule and add $168.55, one-twelfth of a payment, each month. That saves $93,072.07, which is 96.5% of the biweekly saving. The timing of biweekly payments is worth the other $3,374.18 over 24 years. One extra payment once a year saves $89,582.82.
Suppose a company offers to run the biweekly schedule for a $995 setup fee and $100 a year. Over 24 years that is $3,395 in fees, so the net saving drops to $93,051.25, less than adding $168.55 a month yourself. The interest saved covers the fees by year 4.
Example 2: a lower rate shrinks every number
The same $320,000 at 3% over 30 years has a payment of $1,349.14. Biweekly payments save $22,679.81 and end the loan 3 years and 7 months early. One-twelfth extra each month saves $21,701.07, or 95.7% of that. The timing adds $978.74.
At a low rate, the saving is smaller, so fees eat a larger share of it. Run the same $995 and $100 fees on this loan and compare the after-fee result with Example 1.
Example 3: when the fees take a decade to recover
Take a $160,000 mortgage at 4.125% over 30 years, a payment of $775.44. Biweekly payments save $19,637.19 over the life of the loan. A program charging $995 to enroll and $84 a year does not recover its fees until year 10, and costs $3,179 by the time the loan is paid. Adding one-twelfth of a payment each month saves $18,840.18 and costs nothing.
If you might sell or refinance within ten years, a program like this loses money. Compare the payback year with how long you expect to keep this loan.
What the CFPB found in one biweekly program
In 2015 the Consumer Financial Protection Bureau sued Nationwide Biweekly Administration over its "Interest Minimizer" program. The program charged a setup fee of up to $995 plus $84 to $101 a year in processing fees. The CFPB alleged that for its median customer, a $160,000 loan at 4.125%, it would take nine years to recover the fees, and that the program's promise of savings without paying more was false, because customers were paying the equivalent of one extra monthly payment a year.
A federal court found the companies had engaged in deceptive and abusive conduct and imposed a $7.93 million civil penalty, which the Ninth Circuit affirmed in 2025. The lesson is not that biweekly payments are bad. It is that the saving comes from paying more, which you can do yourself for free.
How the schedules are calculated
The monthly payment is the level payment that clears the balance over the months left, rounded up to the cent. Monthly schedules charge one-twelfth of the yearly rate on the balance each month, rounded to the cent, then apply the payment. The one-extra-payment row adds a full payment every twelfth month. The one-twelfth row adds a twelfth of the payment every month.
The biweekly row charges 14 days of interest at the yearly rate divided by 365, then applies half the monthly payment, every 14 days. That assumes the servicer credits each half payment on arrival. Program fees are a setup fee plus a yearly fee for each year the loan runs. The fee break-even year is the first year in which interest saved so far covers fees paid so far. See the methodology limitations.
Mistakes with biweekly plans
- Believing the saving comes from timing. It comes from the 13th payment.
- Paying a setup fee for something your servicer may do for free, or you can do by adding to the monthly payment.
- Assuming half payments are applied right away. Some servicers hold them until the full payment arrives.
- Comparing a program's projected saving with no plan at all, rather than with adding a small amount each month.
- Ignoring the chance of selling or refinancing before the fees are recovered.
Good fits
- Checking a biweekly offer from a lender or a third party.
- Seeing what one extra payment a year is worth.
- Choosing between biweekly and a small monthly extra.
- Finding when a program's fees pay off.
Limits
- Adjustable-rate mortgages.
- Loans with prepayment penalties.
- Escrow, mortgage insurance, or tax effects.
- Lump-sum prepayments. Use the loan payment calculator for a new term.
Biweekly payment questions
These answers cover how biweekly schedules work and what the calculator assumes.
Do biweekly mortgage payments save money?
Yes, mostly because they add money. Half a payment every two weeks is 26 half payments, or 13 full payments a year instead of 12. That extra payment does almost all of the work.
How much of the saving comes from paying more often?
Very little. In the main example, adding one-twelfth of a payment each month captures 96.5% of the biweekly saving with no change in timing. The more frequent payments add the rest.
Is paying one extra payment a year the same as biweekly?
Close. One extra payment each year saves a little less than biweekly because the money arrives later. One-twelfth extra each month lands in between.
Are biweekly payment programs worth the fee?
Rarely. A program that charges a setup fee and a yearly fee has to save that much in interest before you come out ahead, and you can get almost the same saving by adding a small amount to each monthly payment for free.
Does my servicer apply half payments right away?
Ask. Some servicers hold a partial payment until the rest of the monthly payment arrives. If yours does, the timing benefit disappears and only the extra money helps.
Can I set up biweekly payments myself?
Often, through your servicer. If not, adding one-twelfth of your payment each month gets almost the same result and works with any loan that allows extra principal.
Does this include taxes and insurance?
No. It covers principal and interest only. Escrow for property taxes and insurance does not change the interest saved.
Is this financial advice?
No. It is an educational estimate, not financial, tax, or legal advice. Confirm how your servicer applies extra payments before changing your schedule.
Plan the rest of the loan
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Educational estimate only. This calculator does not provide financial, tax, or legal advice. Confirm with your servicer how extra and partial payments are applied before changing your schedule.